In an interview Monday morning, Donald Trump seemed to accuse President Barack Obama of being complicit in the mass shooting in Orlando, Florida, over the weekend, the worst in American history.

"Look, we're led by a man that either is not tough, not smart, or he's got something else in mind," Trump said in an interview Monday morning on Fox News. "And the something else in mind — you know, people can't believe it. People cannot, they cannot believe that President Obama is acting the way he acts and can't even mention the words 'radical Islamic terrorism.' There's something going on. It's inconceivable. There's something going on."

After the shooting, which left 49 people and the shooter dead and 53 injured, Trump issued a statement calling for Obama to step down. When asked on Fox News to explain why he sought for the president to resign, Trump answered in part that Obama, "doesn't get it or he gets it better than anybody understands — it's one or the other and either one is unacceptable."

Trump, the presumptive Republican presidential nominee, has been a loud critic of Obama in recent years, raising repeated questions about the president's citizenship and religion despite evidence to the contrary.

After his Fox News interview, Trump was later asked to clarify his earlier comments during a phone interview on NBC's "TODAY" show.

"Well there are a lot of people that think maybe he doesn't want to get it," Trump said. "A lot of people think maybe he doesn't want to know about it. I happen to think that he just doesn't know what he's doing, but there are many people that think maybe he doesn't want to get it. He doesn't want to see what's really happening."

When further pressed on the program to explain his line of thinking, Trump said Obama is "not addressing the issue. He's not calling it what it is. This is radical Islamic terrorism."

Trump also singled out his Democratic rival, Hillary Clinton, who earlier Monday on "TODAY" called for an assault weapons ban.

The shooting was carried out by Omar Mateen, a 29-year-old who had previously been investigated by the FBI for terror ties, and was ultimately killed by a SWAT team. Mateen had called 911 and swore allegiance to the leader of ISIS before he began his attack on Sunday, law enforcement officials told NBC News.